CN206179069U - Paper currency counterfeit identification apparatus based on offset printing is anti -fake to seal pattern - Google Patents
Paper currency counterfeit identification apparatus based on offset printing is anti -fake to seal pattern Download PDFInfo
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- CN206179069U CN206179069U CN201620934341.0U CN201620934341U CN206179069U CN 206179069 U CN206179069 U CN 206179069U CN 201620934341 U CN201620934341 U CN 201620934341U CN 206179069 U CN206179069 U CN 206179069U
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Abstract
The utility model discloses a paper currency counterfeit identification apparatus based on offset printing is anti -fake to seal pattern, include: the setting is at the white light source and the laser lamp -house that walk paper money passageway top, the 2nd white light source who reaches in the below, a color sensor, with a white light source corresponds, the 2nd color sensor, with the 2nd white light source corresponds, laser sensor, with laser lamp -house corresponds, image processor links to each other with a color sensor, the 2nd color sensor and laser sensor respectively, obtains offset printing in first image and the second image to seal pattern subgraph, with both concatenations for complete white light offset printing to printing the pattern, acquire in the third image the transmission offset printing to the seal pattern, match the unit, link to each other with image processor, will complete white light offset printing to the seal pattern with the offset printing of transmission is matchd the seal pattern, the true and false of offset printing to the seal pattern according to matcing the result, is distinguished to the mirror dummy unit. The device realizes easily that the cost is lower, and it is swift accurate to detect.
Description
Technical field
The present invention relates to image procossing and technology of identification field, and in particular to note detection device.
Background technology
Financial order and interests of the general public are safeguarded, prevents that counterfeit money comes into the market, be that Financial Management mechanism particularly pays close attention to
Problem, the key problem in financial machine and tool field is exactly the false distinguishing of bank note.In the paper currency detection equipment such as traditional paper money counter, cleaning-sorting machine
In adopted in a large number based on the catoptric imaging mode of CMOS/CIS and other image capture devices.With counterfeit money manufacturing technology it is more next
It is higher, must propose to be run into during more efficiently and effectively means are to solve reality it is various counterfeit currency, adulterium currency false distinguishing
Problem.
Existing paper money discrimination system mainly uses CMOS or contact-type image sensor CIS catoptric imagings, obtains anti-
Processed after pseudo- identification image, and be identified according to the anti-counterfeiting mark image after process, to judge to be detected the true of bank note
It is pseudo-.
In addition, Jing retrievals are recognized, the currency false distinguishing that Japan, some national those skilled in the art in Europe propose it is various
In solution, substantial amounts of is, based on the image-forming mechanism of reflective single wavelength light, multi-wavelength's light to be adopted in same equipment
The technical scheme of irradiation collection banknote image, some manufacturers are being studied but still immature, be also introduced at present it is actual should
With.
Imaging in traditional system considers that the visual effect of main emulation human eye is simulated, thus it is substantial amounts of it is reflective into
There is such as CMOS, or the catoptric imaging of line array CCD or other image capture devices and recognize in camera system.Reflective imaging limitation exists
Complicated in recognizer, hardware configuration is complicated, because sending into currency examination equipment has the direction of positive and negative and bank note input, same to a piece of paper
Coin sends into currency examination equipment and there are 4 kinds of situations, that is, obtain one of 4 kinds of possible images, to carry out any direction identification, then at least needs
Two sets of imaging devices and light source are wanted, causes hardware cost to increase, complicated in mechanical structure, product cost is high and to be difficult to commercialization etc. all
Many problems.
Existing paper money discrimination system, its performance directly depends on light source radiation response, and whether needs repeatedly shooting
The features such as (such as mixed point reflection formula Number Reorganization, at least need two CMOS, line array CCD or CIS).Therefore in the selection of light source
With single and inflexible defect, and hardware device high cost.For example, if desired detect infrared signature, based on CMOS or
Then light source must be fixed into infrared light supply for the reflection identification of line array CCD or CIS or other image capture devices and it is necessary at least
It is that two imaging devices just can guarantee that and photograph positive inverse video.Therefore for the currency of country variant, product must be according to feature
It is customized, causes product line species many, is difficult the problems such as commercialization.In the debugging of system hardware, due to hardware number
Amount is more, and the production debugging cycle is relatively long, and equipment wiring is complicated, and the commercialization cycle of product is also relatively long, and this is needing soon
Speed reply false making means are constantly updated for the counterfeit money of development, and the undoubtedly appearance of this kind of product can seriously lag behind the market demand.
And be based in this kind equipment of reflective imaging, these problems cannot avoid, in the premise that system false distinguishing principle does not change
Under, these intrinsic problems cannot fundamentally be resolved.
The content of the invention
The present invention provide it is a kind of based on offset printing to being patterned false proof paper money discrimination device, can exactly detect counterfeit money,
Particularly with the false distinguishing of adulterium currency, effect becomes apparent from.NUS16206
Embodiments provide it is a kind of based on offset printing to being patterned false proof paper money discrimination device, including：
Note input mouth；
Cash dispensing port；
Money transmitting channel；
The first white light source and a LASER Light Source being arranged on above money transmitting channel；
The second white light source being arranged on below money transmitting channel；
First color sensor, is arranged on position corresponding with first white light source；
Second color sensor, is arranged on position corresponding with second white light source；
Laser sensor, is arranged on position corresponding with the LASER Light Source；
Image processor, respectively with first color sensor, second color sensor and the laser sensing
Device be connected, for obtaining described first image and second image in offset printing to being patterned subgraph, both have been spliced into
Whole white light offset printing is to being patterned；The transmission offset printing in the 3rd image is obtained to being patterned；
Matching unit, is connected with described image processor, for by the complete white light offset printing to be patterned with it is described
The offset printing of transmission is matched to being patterned；
False distinguishing unit, for according to matching result, differentiating offset printing to the true and false that is patterned.
Infrared sensing device, is arranged on note input mouth and money transmitting channel junction；
Wherein：
The infrared sensing device sense bank note to be measured by money transmitting channel when, first trigger first white light source and
Second white light source is opened, trigger color sensor gather respectively the first lower image of the first white light source irradiation with
The second image under the second white light source irradiation；Then trigger the LASER Light Source to open, triggering laser sensor collection
The 3rd image under LASER Light Source irradiation.
It is preferred that first color sensor and second color sensor, collection be full width white light reflection
Image；What the laser sensor was gathered is the laser transmission image of full width；Described image processor, to the full width for being collected
Face image is processed, and complementary pair print feature is extracted in the full width face image from after the process.
It is preferred that described image processor is processed the full width face image for being collected, specifically include：To full width face
Image carries out affine transformation, and image normalization, then is filtered process；Or full width face image is carried out at image binaryzation
Reason.
It is preferred that the color sensor adopts contact-type image sensor CIS or CMOS or CCD.
It is preferred that the LASER Light Source is single violet laser light source.
It is preferred that described image processor, is to position the visible ray front respectively according to version information and Information
The visible ray front offset printing of figure is to being patterned the visible ray reverse-offset of region, visible ray reverse side figure to being patterned region and purple light
The purple light of transmission plot transmits offset printing to being patterned region；Using medium filtering to visible ray front offset printing to being patterned area
Domain, the visible ray reverse-offset are filtered to being patterned region and purple light transmission offset printing to being patterned region；Use
Gray value row and, row and be accurately positioned the offset printing of filtered visible ray front to being patterned the visible ray front offset printing pair in region
Be patterned, filtered visible ray reverse-offset to print region visible ray reverse-offset it is saturating with filtered purple light to being patterned
Injection prints the purple light to printing region and transmits offset printing to being patterned, and obtains the offset printing of visible ray front anti-to being patterned subgraph, visible ray
Face offset printing transmits offset printing to being patterned subgraph to being patterned subgraph and purple light；Using regional area adaptive threshold to described visible
The offset printing of light front is entered to being patterned subgraph and purple light transmission offset printing to being patterned subgraph, visible ray reverse-offset to being patterned subgraph
Row binaryzation, obtains the visible ray front offset printing after binaryzation to being patterned subgraph, visible ray reverse-offset to being patterned subgraph
With purple light offset printing is transmitted to being patterned subgraph.
It is preferred that described image processor uses regional area adaptive threshold to visible ray front offset printing to impression
Case subgraph, visible ray reverse-offset carry out binaryzation to being patterned subgraph and purple light transmission offset printing to being patterned subgraph, specially：
It will be seen that the offset printing of light front is divided into 10 × 10 non-overlapped windows to being patterned subgraph, the rectangular histogram of each window is near
Like the superposition for two Gauss distribution；For each bimodal window, in estimation parameter (μ 1, μ 2, the δ 1, δ of bimodal mixed distribution
2) threshold value is calculated on the basis of, the interpolated mode of these threshold values that bimodal window calculation goes out is assigned to accordingly
Single-peaked window threshold value；Each window carries out binaryzation according to corresponding window threshold value to the window；It is described to visible ray
Reverse-offset to be patterned subgraph and purple light transmission offset printing to be patterned the process of subgraph binaryzation with to the offset printing of visible ray front
It is identical to being patterned subgraph binarization；
Wherein, the value of abscissa during first peak value of the expressions of μ 1, the corresponding Gaussian function of first peak value of expression of δ 1
Standard deviation, the value of abscissa during second peak value of expression of μ 2, the standard deviation of the corresponding Gaussian function of second peak value of expression of δ 2.
It is preferred that described image processor by visible ray front offset printing to being patterned subgraph and the visible ray reverse side
Offset printing is spliced to being patterned subgraph, obtains complete offset printing to being patterned, including：
Visible ray front offset printing is overturn to being patterned subgraph, by the visible ray front offset printing after upset to print
Pattern subgraph splices with reverse-offset to being patterned subgraph, obtains the complete offset printing of reverse side to being patterned；Or it is described visible
Light reverse-offset overturns to being patterned subgraph, by the visible ray reverse-offset after upset to being patterned subgraph and front offset printing
Splice to being patterned subgraph, obtain the complete offset printing in front to being patterned.
It is preferred that first color sensor and second color sensor to the offset printing of visible ray front to being patterned
Subgraph and visible ray reverse-offset are that 150DPI resolution, image acquisition width are to the image acquisition height for being patterned subgraph
400DPI resolution；The laser sensor transmits offset printing to the purple light to being patterned the image acquisition height and image of subgraph
Collection width is 100DPI；
Described image processor, by visible ray front offset printing to being patterned subgraph and the visible ray reverse-offset
Splice to being patterned subgraph, after obtaining complete offset printing to being patterned, also by the complete offset printing to being patterned
Reduced height to the 2/3 of former height, reduced width to the 1/2 of former width.
It is preferred that the false distinguishing unit, offset printing is differentiated to the true and false that is patterned according to matching result, including：If described complete
Whole offset printing is more than with purple light transmission offset printing to being patterned to being patterned similarity of the purple light transmission offset printing of subgraph to being patterned
Equal to 0.9, it is true to identify offset printing to being patterned；Otherwise, it is false to identify offset printing to being patterned.
In sum, the paper money discrimination technical scheme that the present invention is provided, it is easy to accomplish, cost of implementation is relatively low, and detection is quick
And it is accurate, so as to can exactly detect counterfeit money, particularly with the false distinguishing of adulterium currency, effect becomes apparent from.It is mutual for offset printing
Mend to printing category feature, the present invention can be detected accurately, can overcome and reflective be imaged on what is just cannot detected in principle
Defect.
Description of the drawings
The paper currency detecting method flow chart that Fig. 1 is provided for the present invention；
Fig. 2 a show the full width face image collected in the embodiment of the present invention；
Fig. 2 b are shown to the pretreated image of banknote image in Fig. 2 a；
Fig. 2 c show the image after processing banknote image in Fig. 2 b；
Fig. 3 a show the full width face image collected in another embodiment of the present invention；
Fig. 3 b show carries out the image after binary conversion treatment to full width face image in Fig. 3 a；
Fig. 4 is that a kind of note detection device provided during the present invention is implemented constitutes schematic diagram.
Specific embodiment
The present invention provide it is a kind of based on offset printing to being patterned false proof paper money discrimination method, above money transmitting channel arrange
First white light source and a LASER Light Source；Second white light source is set below money transmitting channel, by gathering offset printing to being patterned
White-light image and laser image, and compare, complete false distinguishing.Specifically as shown in figure 1, the method includes：
Step S101：Bank note to be measured is by during money transmitting channel, first triggering first white light source and described second
White light source is opened, and triggers the first image and described second that color sensor is gathered respectively under the first white light source irradiation
The second image under white light source irradiation；Then trigger the LASER Light Source to open, triggering laser sensor collection LASER Light Source
The 3rd image under irradiation；
Step S102：Described first image is spliced with the offset printing in second image to being patterned subgraph, is obtained
Offset printing completely is obtained to being patterned；
Step S103：The complete offset printing is transmitted into offset printing to being patterned subgraph to being patterned with the LASER Light Source
Transmission offset printing is matched to being patterned；
Step S104：According to matching result, differentiate offset printing to the true and false that is patterned.
Wherein, the first image and the second image are respectively the direct picture and back side image of bank note；3rd image is
Transmission image, it is preferred that purple light transmission may be selected.
It is preferred that can be acquired to full image, complementary pair print feature is then extracted from the image of full width face, after being
Continuous false distinguishing step is prepared.
Before complementary pair print feature is extracted from the image of full width face, first global image is processed, specifically included：It is right
Full width face image carries out affine transformation, and image normalization, then is filtered process；Or image two is carried out to full width face image
Value is processed.Extract complementary pair print feature in the global image from after process afterwards.For example, full width as shown in Figure 2 a is being obtained
After the image of face, Main Boundaries are gone out by edge extracting, it can be seen that adulterium border is detected substantially.Such as Fig. 2 b institutes
Show.Again information can further be extracted by morphology denoising, obtain image as shown in Figure 2 c.Again for example, obtaining such as figure
After full width face image shown in 3a, binary conversion treatment is carried out to full width face image, obtain image as shown in Figure 3 b.
In one embodiment, the visible ray front elevation can respectively be positioned according to version information and Information
The offset printing of visible ray front is to being patterned the visible ray reverse-offset of region, visible ray reverse side figure to being patterned region and purple light transmission
The purple light of figure transmits offset printing to being patterned region；Using medium filtering to visible ray front offset printing to being patterned region, institute
State visible ray reverse-offset and be filtered to being patterned region to being patterned region and purple light transmission offset printing；Using gray value
Row and, row and be accurately positioned the offset printing of filtered visible ray front to being patterned the visible ray front offset printing in region to impression
Case, filtered visible ray reverse-offset transmit glue to being patterned to the visible ray reverse-offset for printing region with filtered purple light
Print the purple light to printing region and transmit offset printing to being patterned, obtain the offset printing of visible ray front to being patterned subgraph, visible ray reverse side glue
Print transmits offset printing to being patterned subgraph to being patterned subgraph and purple light；Using regional area adaptive threshold to the visible ray just
Face offset printing carries out two to being patterned subgraph and purple light transmission offset printing to being patterned subgraph, visible ray reverse-offset to being patterned subgraph
Value, obtains the visible ray front offset printing after binaryzation to being patterned subgraph, visible ray reverse-offset to being patterned subgraph and purple
Light transmission offset printing is to being patterned subgraph.
Wherein, the use regional area adaptive threshold to visible ray front offset printing to being patterned subgraph, visible
Light reverse-offset carries out binaryzation to being patterned subgraph and purple light transmission offset printing to being patterned subgraph, specially：
It will be seen that the offset printing of light front is divided into 10 × 10 non-overlapped windows to being patterned subgraph, the rectangular histogram of each window is near
Like the superposition for two Gauss distribution；For each bimodal window, in estimation parameter (μ 1, μ 2, the δ 1, δ of bimodal mixed distribution
2) threshold value is calculated on the basis of, the interpolated mode of these threshold values that bimodal window calculation goes out is assigned to accordingly
Single-peaked window threshold value；Each window carries out binaryzation according to corresponding window threshold value to the window；It is described to visible ray
Reverse-offset to be patterned subgraph and purple light transmission offset printing to be patterned the process of subgraph binaryzation with to the offset printing of visible ray front
It is identical to being patterned subgraph binarization；
Wherein, the value of abscissa during first peak value of the expressions of μ 1, the corresponding Gaussian function of first peak value of expression of δ 1
Standard deviation, the value of abscissa during second peak value of expression of μ 2, the standard deviation of the corresponding Gaussian function of second peak value of expression of δ 2.
It is preferred that splicing is specifically included：Visible ray front offset printing is overturn to being patterned subgraph, will be turned over
Visible ray front offset printing after turning is spliced with reverse-offset to being patterned subgraph to being patterned subgraph, obtains reverse side complete
Offset printing is to being patterned；Or the visible ray reverse-offset overturns to being patterned subgraph, by the visible ray reverse side glue after upset
Print is spliced with front offset printing to being patterned subgraph to being patterned subgraph, obtains the complete offset printing in front to being patterned.
It is preferred that being to sense bank note with an infrared sensor in execution step S101, enter paper money when bank note is sensed
During passage, triggering light source is opened and image acquisition.
It is preferred that visible ray front offset printing is to being patterned subgraph and visible ray reverse-offset to being patterned the figure of subgraph
As collection height be 150DPI resolution, image acquisition width be 200DPI resolution, the purple light transmits offset printing to being patterned
The image acquisition height of subgraph and image acquisition width are 100DPI；
It is described by visible ray front offset printing to being patterned subgraph and the visible ray reverse-offset to being patterned subgraph
Spliced, it is described that the complete offset printing is transmitted into glue to being patterned with purple light after obtaining complete offset printing to being patterned
Print is to before being patterned the transmission offset printing of the purple light of subgraph to being patterned and matching, also including：
By the complete offset printing to the reduced height that is patterned to the 2/3 of former height, reduced width to the 1/ of former width
2。
It is preferred that described according to matching result, differentiate offset printing to the true and false that is patterned, including：If the complete offset printing
Offset printing is transmitted to the purple light for being patterned subgraph to the similarity being patterned more than or equal to 0.9 with purple light transmission offset printing to being patterned,
It is true that offset printing is identified to being patterned；Otherwise, it is false to identify offset printing to being patterned.
It is preferred that the color sensor can adopt contact-type image sensor CIS or CMOS or CCD.Implement one
In example, banknote image is absorbed using CIS, CIS is line source irradiation, can easily realize the full width face imaging of bank note, obtained
After the complete image of one banknote, based on image procossing, pattern recognition, the high-end algorithms of computer vision are in integrally being located
Reason.Detection algorithm is suitable for the banknote of unlike material, any spectral region and random color printing.
Due to the mechanical vibration of the equipment such as paper money counter or cash inspecting machine, each banknote is had trickle by the path of money transmitting channel
Difference (deviation).Banknote image is collected in this case rotation, deformation etc. occurs, by for example affine change of subsequent treatment
Change, rotational correction, size normalizing, brightness normalizing etc. can effectively solving.
To the Digital Image Processing in full width face in the embodiment of the present invention, detect in the case where resolution is 640*480pix
Up to 307200 pixels of point, with the traditional scheme ratio that 4,5 points of traditional detection carry out false distinguishing, test point quantity is traditional
Nearly 100,000 times.By the neighborhood coherent detection of image procossing, feature extraction, Morphological scale-space, neural network recognization, obscure poly-
Class, the dynamic tracking scheduling algorithm module of target, the implementation that the present invention is provided can carry out accurate description to genuine note, to vacation
Coin, the identification that technique of composite-RMB bank note can be stable.And the correlation calculations that each method used is between data, it is high level computer
Vision algorithm, rather than the original method of single-point detection.
Based on the detection scheme in full width face, image is carried out by algorithm be just identified analysis after pretreatment, to collection
The image for arriving allows certain error.
It is the analysis to two-dimensional image information in the present embodiment, in the case where genuine note data base need not be set up, passes through
Directly the feature of description genuine note just can reach the purpose of analysis feature, and the detection speed of algoritic module is no with currency type quantity linear
Relation.
Constantly update in bank note fraud means, change more and more frequently under situation, testing equipment will be rapidly adapted to, in time
Update upgrading and circulated with containing counterfeit money, this causes financial institution and businessman to have the initiative status.The device that the present invention is provided, not
Change Already in the case of the mechanically and electrically road of market and actually used equipment, can upgrading products false distinguishing energy rapidly
Under the actual demand of power, to testing equipment only upgrading can need to easily be realized by serial ports or USB.
Because the technical scheme that the present invention is provided is to carry out detection identification based on transmission plot, simulate different from traditional reflection
The flow process of eye recognition, the image for obtaining may be entirely different with image seen by person, same anti-counterfeiting characteristic and reflectogram
May be entirely different.Therefore on the premise of it cannot get transmission plot.Counterfeit currency manufacture group cannot know false proof handling process
And algorithm is realized, with natural system encryption function, the imitation which characteristic point of do not know during fabrication of counterfeiting currency, even if knowing
Road whole frame for movement and whole hardware circuits are cracked and cannot also learn false proof principle, the forgery substantially increased from root
The manufacture difficulty of currency.
The adulterium feature of adulterium currency is that position is not fixed, and adulterium feature is not fixed, and adulterium size is not fixed.Due to altering
The central characteristics of currency are that have a process for splicing, and in reflection some splicing features are not obvious, and special under transmission case
Levy then obvious.For splicing in careful adulterium currency, see from surface (reflective) and be difficult to find out where exception.But by
It is difficult to find the material consistent with genuine note in material in counterfeiting currency, causes the stitching portion under transmission case to have obvious material
Qualitative change, although in reflective very hidden stitching portion, splicing is still obvious in transmission.By contrasting the prominent of material
Become, adulterium currency can easily be identified using the technology of image procossing.Therefore for the detection of adulterium currency is based on transmission
Detect that the mode relative to reflective imaging has inherent advantage in full width face.
With reference to Fig. 2, the embodiment of the present invention additionally provide it is a kind of based on offset printing to being patterned false proof paper money discrimination device, wrap
Include：
Note input mouth 401；
Cash dispensing port 402；
Money transmitting channel 403；
It is arranged on first white light source 404 and a LASER Light Source 405 of the top of money transmitting channel 403；
It is arranged on the second white light source 406 of the lower section of money transmitting channel 403；
First color sensor 407, is arranged on and the corresponding position of first white light source 404；
Second color sensor 408, is arranged on and the corresponding position of second white light source 406；
Laser sensor 409, is arranged on and the corresponding position of the LASER Light Source 405；
Image processor 410, respectively with first color sensor 407, second color sensor 408 and described
Laser sensor 409 be connected, for obtaining described first image and second image in offset printing to being patterned subgraph, by two
Person is spliced into complete white light offset printing to being patterned；The transmission offset printing in the 3rd image is obtained to being patterned；
Matching unit 411, is connected with described image processor 410, for by the complete white light offset printing to being patterned
Offset printing with the transmission is matched to being patterned；
False distinguishing unit 412, for according to matching result, differentiating offset printing to the true and false that is patterned.
Infrared sensing device 413, is arranged on note input mouth 401 and the junction of money transmitting channel 403；
Wherein：
The infrared sensing device 413 senses bank note to be measured by during money transmitting channel 403, first triggering described first
White light source 404 and second white light source 406 are opened, and triggering color sensor gathers respectively first white light source
The second image under the first image and second white light source 406 irradiation under 404 irradiations；Then the LASER Light Source is triggered
405 open, and trigger the 3rd image under the collection LASER Light Source 405 of laser sensor 409 irradiates.
It is preferred that first color sensor 407 and second color sensor 408, collection is the white of full width
Light reflected image.What the laser sensor 409 was gathered is the laser transmission image of full width.Described image processor 410, to institute
The full width face image for collecting is processed, and complementary pair print feature is extracted in the full width face image from after the process.
It is preferred that the full width face image that described image processor 410 pairs is collected is processed, specifically include：To complete
Breadth image carries out affine transformation, and image normalization, then is filtered process；Or image two-value is carried out to full width face image
Change is processed.
It is preferred that first color sensor 407 and second color sensor 408 are sensed using contact type image
Device CIS or CMOS or CCD.
It is preferred that the LASER Light Source 405 is single violet laser light source 405.
It is preferred that described image processor 410, is to position the visible ray respectively just according to version information and Information
The visible ray front offset printing of face figure is to being patterned the visible ray reverse-offset of region, visible ray reverse side figure to being patterned region and purple
The purple light of light transmission figure transmits offset printing to being patterned region；Using medium filtering to visible ray front offset printing to being patterned area
Domain, the visible ray reverse-offset are filtered to being patterned region and purple light transmission offset printing to being patterned region；Use
Gray value row and, row and be accurately positioned the offset printing of filtered visible ray front to being patterned the visible ray front offset printing pair in region
Be patterned, filtered visible ray reverse-offset to print region visible ray reverse-offset it is saturating with filtered purple light to being patterned
Injection prints the purple light to printing region and transmits offset printing to being patterned, and obtains the offset printing of visible ray front anti-to being patterned subgraph, visible ray
Face offset printing transmits offset printing to being patterned subgraph to being patterned subgraph and purple light；Using regional area adaptive threshold to described visible
The offset printing of light front is entered to being patterned subgraph and purple light transmission offset printing to being patterned subgraph, visible ray reverse-offset to being patterned subgraph
Row binaryzation, obtains the visible ray front offset printing after binaryzation to being patterned subgraph, visible ray reverse-offset to being patterned subgraph
With purple light offset printing is transmitted to being patterned subgraph.
It is preferred that described image processor 410 uses regional area adaptive threshold to visible ray front offset printing pair
Be patterned subgraph, visible ray reverse-offset carries out binaryzation to being patterned subgraph and purple light transmission offset printing to being patterned subgraph, has
Body is：
It will be seen that the offset printing of light front is divided into 10 × 10 non-overlapped windows to being patterned subgraph, the rectangular histogram of each window is near
Like the superposition for two Gauss distribution；For each bimodal window, in estimation parameter (μ 1, μ 2, the δ 1, δ of bimodal mixed distribution
2) threshold value is calculated on the basis of, the interpolated mode of these threshold values that bimodal window calculation goes out is assigned to accordingly
Single-peaked window threshold value；Each window carries out binaryzation according to corresponding window threshold value to the window；It is described to visible ray
Reverse-offset to be patterned subgraph and purple light transmission offset printing to be patterned the process of subgraph binaryzation with to the offset printing of visible ray front
It is identical to being patterned subgraph binarization；
Wherein, the value of abscissa during first peak value of the expressions of μ 1, the corresponding Gaussian function of first peak value of expression of δ 1
Standard deviation, the value of abscissa during second peak value of expression of μ 2, the standard deviation of the corresponding Gaussian function of second peak value of expression of δ 2.
It is preferred that described image processor 410 by visible ray front offset printing to being patterned subgraph and the visible ray
Reverse-offset splices to being patterned subgraph, obtains complete offset printing to being patterned, including：
Visible ray front offset printing is overturn to being patterned subgraph, by the visible ray front offset printing after upset to print
Pattern subgraph splices with reverse-offset to being patterned subgraph, obtains the complete offset printing of reverse side to being patterned；Or it is described visible
Light reverse-offset overturns to being patterned subgraph, by the visible ray reverse-offset after upset to being patterned subgraph and front offset printing
Splice to being patterned subgraph, obtain the complete offset printing in front to being patterned.
It is preferred that first color sensor 407 and second color sensor 408 are to the offset printing pair of visible ray front
It is 150DPI resolution, image acquisition width that subgraph and visible ray reverse-offset are patterned to the image acquisition height for being patterned subgraph
Degree is 400DPI resolution；The purple light transmission offset printing of the laser sensor 409 pairs is high to the image acquisition for being patterned subgraph
Degree and image acquisition width are 100DPI；
Described image processor 410, by visible ray front offset printing to being patterned subgraph and the visible ray reverse side
Offset printing is spliced to being patterned subgraph, after obtaining complete offset printing to being patterned, also by the complete offset printing to impression
The reduced height of case to the 2/3 of former height, reduced width to the 1/2 of former width.
It is preferred that the false distinguishing unit 412, offset printing is differentiated to the true and false that is patterned according to matching result, including：If described
Complete offset printing transmits offset printing to transmit offset printing to the purple light for being patterned subgraph big to the similarity that is patterned to being patterned with purple light
In equal to 0.9, it is true to identify offset printing to being patterned；Otherwise, it is false to identify offset printing to being patterned.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area skill
Art personnel without departing from the spirit and scope of the present invention, can make possible variation and modification, therefore the guarantor of the present invention
The scope that shield scope should be defined by the claims in the present invention is defined.
Claims (4)
1. it is a kind of based on offset printing to being patterned false proof paper money discrimination device, it is characterised in that include：
Note input mouth；
Cash dispensing port；
Money transmitting channel；
The first white light source and a LASER Light Source being arranged on above money transmitting channel；
The second white light source being arranged on below money transmitting channel；
First color sensor, is arranged on position corresponding with first white light source；
Second color sensor, is arranged on position corresponding with second white light source；
Laser sensor, is arranged on position corresponding with the LASER Light Source；
Image processor, respectively with first color sensor, second color sensor and the laser sensor phase
Even, both are spliced into into complete white light offset printing to being patterned subgraph for the first image of acquisition and the offset printing in the second image
To being patterned；The transmission offset printing in the 3rd image is obtained to being patterned；
Matching unit, is connected with described image processor, for by the complete white light offset printing to being patterned and the transmission
Offset printing match to being patterned；
False distinguishing unit, for according to matching result, differentiating offset printing to the true and false that is patterned；
Infrared sensing device, is arranged on note input mouth and money transmitting channel junction；
Wherein：
When the infrared sensing device senses bank note to be measured by money transmitting channel, first white light source and described is first triggered
Second white light source is opened, and triggers the first image that color sensor gathered respectively under first white light source irradiation and described
The second image under the irradiation of second white light source；Then trigger the LASER Light Source to open, triggering laser sensor collection laser
The 3rd image under light source irradiation.
2. device as claimed in claim 1, it is characterised in that：
First color sensor and second color sensor, collection be full width white light reflectance image；It is described to swash
What optical sensor was gathered is the laser transmission image of full width；
Described image processor, the full width face image to being collected is processed, in the full width face image from after the process
Extract complementary pair print feature.
3. device as claimed in claim 1, it is characterised in that：
The color sensor adopts contact-type image sensor CIS or CMOS or CCD.
4. device as claimed in claim 1, it is characterised in that：
The LASER Light Source is single violet laser light source.
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| CN201620934341.0U CN206179069U (en) | 2016-08-24 | 2016-08-24 | Paper currency counterfeit identification apparatus based on offset printing is anti -fake to seal pattern |
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| CN201620934341.0U CN206179069U (en) | 2016-08-24 | 2016-08-24 | Paper currency counterfeit identification apparatus based on offset printing is anti -fake to seal pattern |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107527422A (en) * | 2017-07-03 | 2017-12-29 | 深圳怡化电脑股份有限公司 | A kind of offset printing is to print detection method, device, terminal device and readable storage medium storing program for executing |
| CN108062820A (en) * | 2017-11-29 | 2018-05-22 | 深圳怡化电脑股份有限公司 | A kind of paper currency detecting method, note detection device and electronic equipment |
| CN108171866A (en) * | 2018-01-09 | 2018-06-15 | 深圳怡化电脑股份有限公司 | Acquisition methods, device, ATM and the storage medium of banknote prints data |
-
2016
- 2016-08-24 CN CN201620934341.0U patent/CN206179069U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107527422A (en) * | 2017-07-03 | 2017-12-29 | 深圳怡化电脑股份有限公司 | A kind of offset printing is to print detection method, device, terminal device and readable storage medium storing program for executing |
| CN107527422B (en) * | 2017-07-03 | 2019-06-11 | 深圳怡化电脑股份有限公司 | A kind of offset printing is to print detection method, device, terminal device and readable storage medium storing program for executing |
| CN108062820A (en) * | 2017-11-29 | 2018-05-22 | 深圳怡化电脑股份有限公司 | A kind of paper currency detecting method, note detection device and electronic equipment |
| CN108062820B (en) * | 2017-11-29 | 2019-10-15 | 深圳怡化电脑股份有限公司 | A kind of paper currency detecting method, note detection device and electronic equipment |
| CN108171866A (en) * | 2018-01-09 | 2018-06-15 | 深圳怡化电脑股份有限公司 | Acquisition methods, device, ATM and the storage medium of banknote prints data |
| CN108171866B (en) * | 2018-01-09 | 2020-07-21 | 深圳怡化电脑股份有限公司 | Method and device for acquiring paper money pattern data, ATM and storage medium |
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